Device and method for molding magnetic powder

Abstract

Provided are a device and method for molding magnetic powder. The device includes a frame, a mold lifting mechanism, a plate pressing mechanism, a punch mechanism and a height locking mechanism. The mold lifting mechanism includes a mold and a first driving member for moving the mold up and down. The plate pressing mechanism includes a pressing plate and a second driving member for moving the pressing plate up and down. The punch mechanism includes a punch and a third driving member for moving the punch up and down. The height locking mechanism includes a first locking piece for locking the pressing plate and a second locking piece for locking the punch. The mold reciprocates upward and downward, such that a filling density of the magnetic powder is kept uniform, and the density distribution difference of the magnetic powder in a height direction is reduced.

What is claimed is: 
     
         1 . A magnetic powder molding device comprising: a frame, a mold lifting mechanism, a plate pressing mechanism, a punch mechanism, and a height locking mechanism, wherein
 the mold lifting mechanism, the plate pressing mechanism, the punch mechanism, and the height locking mechanism are arranged on the frame,   the mold lifting mechanism comprises a mold, and a first driving member for driving the mold to move up and down, a top of the mold being provided with a molding cavity,   the plate pressing mechanism moves up and down synchronously with the mold, and the plate pressing mechanism comprises a pressing plate, and a second driving member for driving the pressing plate to move up and down, the pressing plate is provided with a through slot corresponding to the molding cavity,   the punch mechanism comprises a punch, and a third driving member for driving the punch to move up and down, the punch passing through the through slot and then extending into the molding cavity to form a molding fit, and   the height locking mechanism comprises a first locking piece and a second locking piece, the first locking piece is configured to lock or unlock the pressing plate to lock a height position of the pressing plate, and the second locking piece is configured to lock or unlock the punch to lock a height position of the punch.   
     
     
         2 . The magnetic powder molding device according to  claim 1 , wherein the frame comprises a base, a first guiding rod and a top plate, and wherein a bottom end of the first guiding rod is fixed to the base, and a top end of the first guiding rod is fixedly connected to the top plate. 
     
     
         3 . The magnetic powder molding device according to  claim 2 , wherein the first driving member comprises a first driving motor, a rotary disc and a roller, wherein an end of an output shaft of the first driving motor is connected to the rotary disc, and an axis of the rotary disc coincides with an axis of the output shaft of the first driving motor, and the roller is eccentrically arranged on a disc surface of the rotary disc,
 the mold comprises a bottom plate, a mold body and a connecting plate, wherein the mold body is fixed on the bottom plate, the bottom plate is guided by and fitted to the first guiding rod, a first end of the connecting plate is connected to the bottom plate, and a second end of the connecting plate abuts against the roller. 
 
     
     
         4 . The magnetic powder molding device according to  claim 3 , wherein an encoding disc for indicating a rotation angle of the rotary disc is provided along a circumferential direction of the rotary disc. 
     
     
         5 . The magnetic powder molding device according to  claim 3 , wherein the second driving member comprises a first driving air cylinder, a second guiding rod and a first support, wherein a bottom end of the second guiding rod is connected to the bottom plate, the first support is located above the mold, the first driving air cylinder is fixed on a top of the first support, a piston rod of the first driving air cylinder extends downward, an end of the piston rod of the first driving air cylinder is connected to a top of the second guiding rod, and the pressing plate is fixed on a bottom of the first support, and the pressing plate is guided and fitted on the second guiding rod. 
     
     
         6 . The magnetic powder molding device according to  claim 5 , wherein the third driving member comprises a first driving electric cylinder and a second support, the first support is provided with an accommodating space, and the second support is received in the accommodating space, and
 the first driving electric cylinder is fixed on the top plate, the punch is fixed on a bottom of the second support, and an output shaft of the first driving electric cylinder extends downward and is connected to the punch by sequentially passing through the first support and the second support.   
     
     
         7 . The magnetic powder molding device according to  claim 6 , wherein the third driving member further comprises a third guiding rod which is fixed on the pressing plate, and the second support is guided by and fitted on the third guiding rod. 
     
     
         8 . The magnetic powder molding device according to  claim 6 , wherein the first locking piece is fixed on the first support, the second locking piece is fixed on the second support, and the output shaft of the first driving electric cylinder sequentially passes through the first locking piece and the second locking piece. 
     
     
         9 . A method for molding magnetic powder using the device according to  claim 1 , comprising:
 S 100 : setting the mold at a given height;   S 101 : driving the pressing plate by the second driving member to move down until the pressing plate tightly presses against the mold;   S 102 : driving the punch by the third driving member to move down until the punch reaches to a specified height, and then fixing the punch at the specified height by the height locking mechanism;   S 103 : driving the mold by the first driving member to move, with a predetermined speed, up to a predetermined height and down in a reciprocal manner;   S 104 : moving the mold, the pressing plate and the punch to initial positions;   S 105 : taking out a molded magnetic powder body in the mold.